Perhaps you should try some spelling variations:
"estudios serie administracion regional." » "estudios serie administracion local." (Expand Search), "estudios serie administracion espana." (Expand Search), "estudios serie administrativa regional." (Expand Search), "estudios de administracion regional." (Expand Search), "estudios e administracion regional." (Expand Search), "estudios socio administracion regional." (Expand Search), "studies series administracion regional." (Expand Search)
"estudios sobre administracion regional." » "estudios sobre administracion local." (Expand Search), "estudios sobre administracion espana." (Expand Search), "estudios de administracion regional." (Expand Search), "estudios e administracion regional." (Expand Search), "estudios entre administraciones regional." (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("estudios serie administracion regional.") OR ("estudios sobre administracion regional."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"estudios serie administracion regional.\") OR (\"estudios sobre administracion regional.\"))".
• Removing quotes may allow a broader search: (( estudios serie administracion regional. ) OR ( estudios sobre administracion regional. )).
• Adding a wildcard symbol may retrieve word variants: (("estudios serie administracion regional.") OR ("estudios sobre administracion regional."))*.